Piggybacking on this answer, it's also because there is a cost (money, time, knowledge, dev sophistication, etc) to doing it that way.
When people don't see something as an issue b/c they aren't disabled themselves, and it would take extra time / consideration / money to support disabled folks, people won't do it.
That is why in the US we had to legislate handicap accessibility in the real world. People don't build ramps unless they have to.
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Piggybacking on this answer, it's also because there is a cost (money, time, knowledge, dev sophistication, etc) to doing it that way.
When people don't see something as an issue b/c they aren't disabled themselves, and it would take extra time / consideration / money to support disabled folks, people won't do it.
That is why in the US we had to legislate handicap accessibility in the real world. People don't build ramps unless they have to.